Chapter 3 - ACS Calibration Pipeline describes On-the-Fly-Reprocessing (OTFR)1 of data from the STScI Archive. There are two major updates:

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calacs, the standard ACS calibration software, has undergone significant updates that include corrections to post-SM4 WFC image artifacts. In addition, the software now generates two sets of calibrated products: one with standard calibrations and another set with pixel-based CTE corrections.